Take a look at Paula McDonalds comparison of the two machines on Reelskin. She is an amazing artist from the U.K. Many schools are now recommending the New PMU Reelskin to their students.
It was created specifically for PMU artists to be more consistent with the skin we tattoo on. It is stretchable so you can literally stretch it when tattooing just like on a client. If you go to deep you will cut thru the skin so you can work on your pressure.
The two side are different so you can have two experiences. The shiny side will give you a crisp clean stroke like perfect skin, the softer side will give you an experience of working on more sensitive skin.
It’s a must try!